Telegraph system



A. w. POST. TELEGRAPH SYSTEM. APPLICATION FILED MAR. 20, 192D. 1,395,007. Patented Oct. 25, 1921.

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, A TTORNEY' A. w. POST. TELEGRAPH SYSTEM. APPLICATION FILED MAR 20, I920.

1,395,007, Patented Oct. 25, 1921.

2 SHEETS-SHEET 2 i Q P7 INVENTORfl A TTORNEY UNITED STATES PATENT OFFICE.

ARTHUR W. POST, OF WESTBURY, NEW YORK, ASSIG-NOR TO AMERICAN TELEPHONE AND TELEGRAPH COMPANY,A CORPORATION OF NEW YORK.

TELEGRAPH SYSTEM.

Specification of Letters Patent.

Patented Oct. 25, 1921.

Application filed March 20, 1920; Serial No. 367,572.

To all whom it may concern:

Be it known that I, ARTHUR V. PosT, residing at VVestbury, in the county ofNassau and State of New York, have invented certain Improvements in Telegraph Systems, of which the following is a specification.

This invention relates to telegraph systemsiand more particularly to an arrangement to facilitate signaling between a Morse line subscriber and the attendant at a relay office.

In telegraph systems it has been customary to'terminate telegraph lines, having duplex sets, repeaters, etc. associated therewith, at a plurality of jacks known as the Morse line terminal which was located at a test board. The Morse subscriber loops terminated at the same testboard in a plurality of plugs adapted for insertion in the jacks of the Morse line terminal in order to connect the subscribers with the line 'ci'rcuits. Associated with each Morse line terminal was asignal under control of a push button connected with the subscribers loop circuit. l/Vhenever a Horse subscriber desired to attract the attention of the attendant at the testboard he pressed the button which caused the operation of the signal associated with the Morse line terminal with which his particular loop was connected. Upon receiving this signal the attendant would go in on the circuit at the duplex table and communicate with the subscriber.

If, however, it is desired to substitute another duplex set for the set that is nor mally connected between the line and the Morse line terminal at which the subscribers loops are terminated, the substitution has been effected by connecting, by means of a patching cord, the drop jack of the said Morse line terminal with the receivingleg jack of the second 'dupl'ex'set and connecting the said second duplex set with the telegraph line circuit by means of a suitable patching cord. Since the signal at the testboard is associated only with the Morse line terminal and not with the duplex set, if'a Morse subscriber signals the office after his circuit has been patched to another duplex set the repeater attendant at the office would, upon receiving the signal at the particular Morse line terminal, have to consult a record in order to determine the particular duplex set with which the said Morse line terminal was connected before he could take the proper action required.

It is the object of this invention to provide signaling means individual to the duplex sets which will be responsive to signals transmitted from any subscribers loop with which the said duplex set may be connected.

This invention will be more clearly understood from the following description when read in connection with the attached drawing which, when Figure 2 is placed to the right of Fig. 1, represents the terminal telegraph circuits in which the invention is embodied.

In Fig. 1, L and L represent two telegraph line circuits or telegraph legs of composited telephone circuits which terminate at the testboard in the jacks J and J respecitvely. The line L loops through the jacks J and J and is connected by means of conductor 1 with a duplex set D This set comprises a bridge coil 2, a polar relay cated at a duplex table and have associatedtherewith the signals 8, ad S respectively and their control keys K and K respectively. These signal devices are indicated as lamps which may be supported on high standards so as to readily attract the attention of the attendant to the particular duplex set with which they are respectively associated. The said duplex sets D and D have also associated therewith the receiving leg jacks J and J respectively, through which the line circuit loops to the Morse line terminals MT and MT,.

The Morse line terminals, which are similar, comprise a plurality of jacks the functions of which are broadly to terminate the line from the duplex set and to afford means for connecting a plurality of subscribers loops to a particular line. Thus the Morse line terminal MT comprises a looping jack J and a line jack J drop jacks J and J a battery jack J s and three Morse loop jacks, J and J and J The line jack is connected through the conductor 10, with the receiving leg jack J of the duplex set v 1),. The drop jack J 7 is connected through conductor 11 with the jack J 3 and is thereby connected with the signal lamp 8,. Associated with the jacks J J and J are the plugs P P and P of the subscribers loops L L and L having associated therewith the standard subscriber e uipment comprising the keys K K and I 5 respectively and relays R R and R respectively, and also push buttons 13,, B and 13 respectively adapted to connect the sleeve side of the line to ground thereby controlling the operation of the signals connected with the Morse line terminal and the duplex set. Also associated with the Morse line terminal MT are the relays 'R, and R R, being connected in balanced condition in the line circuit but adapted to be unbalancedby the operation of one of the said push buttons so as to set in operation the signaling apparatus heretofore referred to. The equipment associated with the Morse line terminal MT is similar to that associated with the terminal MT, and needs no detailed description. 7

Having in mind the foregoing description of the apparatus and of the function of each part, this invention will be clear from the following description of its mode of opera.- tion. Let it be assumed that the subscribers loop circuits L L and L,, for example, are connected with the Morse line terminal MT Y which is adapted to terminate the telegraph 51 line L with which is normally connected the duplex set 1),. If in the course of opera-' tion the subscriber upon loop L desires to attract the attention of the attendant at the testboard at which the line L terminates and in which office the duplex set D is located he will press the button 13 which serves to ground the sleeve side of the loop L This results in a flow of current from battery B, through contacts of jacks J, and J,, the right hand winding of relay R,, sleeve contacts of jacks J and plug P and through the button B to ground, which serves'to unbalance the relay R and thereby effect the operation of the said relay.

It will be seen that relay R, is normally in a balanced condition-by the flow of equal amounts of current in opposite directions through its windings from battery 13,, contacts of jacks J and J right hand winding of relay R, through the plurality of loop circuits in series, the left hand winding of relay R contact of jack J contact of acks J 7 .and J conductor 10, contact of jack J contact of relay R and the winding of the pole changing relay R telegraph key K and battery B to ground. As the result of the operation of the button B and the unbalancing of relay R current will flow from battery 13 over its left hand contact through the winding of relay R upper contact of jack J upper contact of J,, upper contact of jack J and through the signal lamp 8, and key K, to ground, thereby operating the lamp S RelayR will also beoperated and locked up through its left hand contact thereby lighting the lamp S associated with the Morse line terminal MT and if desired, setting in operation a buzzer associated with the said lamp but not shown. Upon the lighting of the lamp S the repeater attendant will go to the duplex table at which the set D is located and operate the key K thereby releasing relay R and extinguishing the lamps S and S and willget in com munication with the Morse subscriber by the operation of the telegraph key- K If the duplex set D,, associated normally with the Morse line terminal MT,, is defective, or if, for any other reason it is desired to connect another duplex set D with the line L with which the subscribers loops L L, and L are associated, a' two-conductor patching cord G terminating in the plugs P and P, may be used by inserting the plug P in the drop jack J and plug P in the receiving leg jack J associated with the duplex set 1),. In order to connect the duplex set D with the line L a similar cord having plugs P and P may be used by inserting plug P in jack J of the line L and the plug P in the line jack J, of the line L,. This results in the connection of the line L through the tip contacts of jack J andplug P and the cord C, with the tip contacts of plug P and jack J with the conductor 9, which connects with the bridge coil of the duplex set D 'The 'receiving leg of the duplex set D is connected through the tip contacts of ack J; and plug 1 cord C and the tip contacts of plug P and jack J, with the conductors of the .Morse line terminal MT with which the loop circuits are connected.

If a subscriber connected with the loop L now presses 'thebutton B in order to attract the attention of the Morse line attendant, the relay R, associated with the terminal MT will be operated. Asa result of the operation of relay R current will flow from the battery 13 through the contact of relay R, and the winding of relay R upper contact of-jack J sleeve contacts of jack J, and plug P cord C sleeve contacts of plu P, and .jack J, throu h theisignal Lamp of set D, and the key Ti, operating the lamp S Relay R, will also be operated and locked up through its left hand contact thereby operating the lamp, 8,, associated with the Morse line terminal MT and operating a buzzer associated with said lamp but not shown. It'will be seen also that through the opening of the upper contact of jack J by'the insertion therein of the plug P the circuit through the lamp S associated with the duplex set D, is

to ground, thereby V opened, thereby preventing the operation of the latter lamp. When the attendant notices the lighting of the lamp S he will go directly to the duplex table upon which the set D is located and operate key K thereby releasing relay R and extinguishing the lamps S and S and will get in communication with the subscriber from that point.

It will be seen that this arrangement provides a signaling device associated with the duplex set itself and controllable by means associated with any Morse loop that may be operating through the said duplex set. Furthermore, the signaling means are individual to the duplex set and consequently they may be disconnected from a particular Morse line terminal whenever the subscribers loop circuits associated with that terminal are patched to another duplex set, the said other duplex set having similar signaling means associated therewith responsive to signals from any subscribers loops that may be connected thereto.

Although this invention has been described in the foregoing specifications in connection with a telegraph duplex set, it is to be understood that it is not so limited but may be applied to various types of ofiice apparatus designed to be interchangeably connected with similar apparatus normally connected With other line circuits.

Although this invention has been disclosed as embodied in a particular form it is to be understood that it is capable of embodiment in other and different forms from that shown Without departing from the spirit and scope of the appended claims.

What is claimed is:

1. In a telegraph signaling system the combination of a duplex set having signaling apparatus associated therewith, a Morse line terminal having a relay associated therewith, a subscribers loop circuit, and means associated with the said loop circuit to effect the operation of the said relay and thereby to cause the operation of the said signaling apparatus associated with the duplex set.

2. In a telegraph signaling system the combination of a duplex set having signal ing apparatus associated therewith, a Morse line terminal connected with the said duplex set and having arelay associated therewith normally balanced by the flow of current through its windings, a plurality of subscribers loop circuits connected with the said Morse line terminal and means associated with each of said loop circuits adapted to unbalance the fiow of current through said relay, thereby causing the operation of the signaling apparatus associated with the duplex set.

3. In a telegraph signaling system the combination of a plurality of duplex sets each having individual signaling apparatus associated therewith, a plurality of Morse line terminals, switching means to connect each set with one of said terminals, a subscribers loop circuit connected with one of said Morse line terminals and having means to control the signaling apparatus of the associated duplex set, a patching cord adapted to effectively connect the said loop circuit of one Morse line terminal with the duplex set of the other Morse line terminal whereby the signaling apparatus of the latter duplex set may be controlled by the means associated with the said subscribers loop circuit.

l. In a telegraph signaling system the combination of the telegraph leg of a composited line circuit having associated therewith a duplex set and a Morse line terminal, a second telegraph leg also having a corresponding duplex set and Morse line terminal, signaling devices individual to each duplex set, a subscribers loop circuit associated with the said first Morse line terminal having means to control the operation of the signaling device associated with the duplex set, and patching cords adapted to connect said second duplex set with said first telephone line and said first Morse line terminal and also adapted to disconnect automatically the said first duplex set from its associated line and Morse line terminal and to bring the signaling device of the second duplex set within control of the said subscribers loop circuit.

5. In a telegraph signaling system the combination of a plurality of telegraph legs of composited lines each having a repeater and a Morse line terminal associated therewith, signaling apparatus individual to each repeater, a plurality of subscribers loop circuits connected with one of said Morse line terminals having means to control the operation of the repeater signaling apparatus, and switching means to interchange the line and the terminal connections of each of said repeaters, the said means being so designed as always to bring the signaling apparatus of the connected repeater within control of each subscribers loop circuit.

In testimony whereof, I have signed my name to this specification this 18th day of March, 1920.

ARTHUR W. POST. 

